TI's IO-LINK PHY devices feature fault protection

June 28, 2013

Toni_McConnel-June 28, 2013

Texas Instruments' new fully-integrated IO-LINK physical (PHY) layer devices, the SN65HVD101 and SN65HVD102, replace discrete implementations and provide high output current and high operating temperatures, enabling their use in point-to-point communication applications such as pressure, level, temperature or flow IO-LINK sensors and IO-LINK actuator drives and valves in harsh industrial applications.

Key features

  • Integration slashes board space: The new IO-LINK PHY devices integrate a voltage regulator with the ability to supply up to 20 mA for local circuits, which reduces board area by 50 percent compared to discrete implementations and enables adaptation to existing 3.3-V or 5-Vcontrollers.
  • Survives cross-wire faults: These devices integrate up to 40-V, steady-state protection to prevent damage due to installation faults or cable breaks. Up to 50-V transient protection prevents damage from power surges on field voltages, eliminating the need for an external protection device.
  • Highest operating temperature: With an operating temperature range of -40 C to +105 C, the SN65HVD101 and SN65HVD102 are the only IO-LINK PHY devices with robust capability for use in harsh industrial applications.
  • Widest output current range: These ICs drive up to 480 mA for interoperability with a wide range of sensors and small actuators, while competitors drive at 300 mA or less. The output current can also be set with a single resistor to provide self-limiting for safe operation in lower-power applications.


Solutions utilizing IO-LINK require a microcontroller (MCU) in the slave device configuration of the standard. TI’s ultra-low power MSP430TM MCUs are the best fit for point-to-point communication and low-power operation. With up to 512KB of flash memory and integrated analog-to-digital converters (ADCs), these MCUs are equipped to quickly process data from various types of sensors.

The SN65HVD101EVM is available to evaluate device parameters while acting as a guide for board layout. It can be ordered today for US$79.

The SN65HVD101 and SN65HVD102 are available in a 4-mm by 3.5-mm, 20-pin VQFN package. Suggested retail pricing in 1,000-unit quantities starts at US$2.23.

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